|
|
|
|
|
| Craswell, Eric T.; Grote, Ulrike; Henao, Julio; Vlek, Paul L.G.. |
| This paper addresses the issue of environmental and ecological impacts of nutrient flows within and between countries by reviewing and presenting data on nutrient balances and global nutrient movements. The results for nutrient depletion in agricultural soils during 1996-1999 show that in most countries in Africa and Latin America and the Caribbean rates of depletion are so high that current land use is not sustainable. At the other end of the scale, nutrient surplus derived from agriculture is most serious in the USA and industrialized countries of Europe, but also occurs in some densely populated areas of countries such as India and China. International net flows of NPK in traded agricultural commodities were estimated to total 4.8 Tg in 1997 and... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/18734 |
| |
|
|
| Mitra, Sudip; Wassmann, Reiner; Vlek, Paul L.G.. |
| Wetlands are among the most important natural resources on earth, as sources of biological, cultural and economic diversity. Conservation and management of wetlands have been identified as priority tasks for action in international conventions and regional policies, but extensive wetland area has been degraded in many developing countries. These continuing destruction demands to be restricted or at least slowed down. The primary objectives of this study were (i) assessing ecological functions and concepts for sustainable use of wetlands and (ii) compiling relevant information sources on geographic distribution of wetlands as well as their role in the global carbon budget. Wetlands comprise a pivotal global carbon reservoir and can moreover sequester... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2003 |
URL: http://purl.umn.edu/18771 |
| |
|
|
|
